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| The scientific study of interactions among organisms |
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| The portion of the Earth that supports life |
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| The nonliving parts of an organisms' environment. |
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| All the living organisms that inhabit an environment. |
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| A group of organisms that one species that interbreed and live in the same place at the same time. |
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| A collection of interacting populations |
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| made up of interactions among the populations in a community and the commmunity's physical surroundings, or abiotic fators. |
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| The place where an organism lives throughout its life. |
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| The role and posistion a species has in its environment. |
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| the realtionship which there is a close and permanent asssociation among organisms of different species. |
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| the realtionship which there is a close and permanent asssociation among organisms of different species. |
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| A symbiotic relaionship in which both species benefit. |
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| A symbiotic realtionship in which one organism benefits at the expense of another. |
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| Organisms that use energy stored in chemical compounds to manufacture their own nutrients. |
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| Organisms that cannot make their own food and must feed on other organisms. |
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| Animals that feed on animals that have already died. |
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| Organisms that break down and absorb nutrients from dead organisms. |
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| A simple model that scientists use to show how matter and energy move through an ecosysytem. |
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| Organism in a food chain that represents a feeding step in the passage of energy and materials through an ecosystem. |
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| Model that expresses all the possible feeding relationships at each trophic level in a community. |
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